Fuel Pump Fuse Location (How to Locate the Fuel Pump Fuse)

Would you like to know your fuel pump fuse location? As well as symptoms of a bad fuel pump?

The fuel system in a car has very important/crucial parts, and one of them is the fuel pump fuse.

The major function of this important part of the fuel system is to provide power whenever fuel pressure is needed in the rail. The fuel pump fuse can fail for certain reasons.

This article brings details regarding the signs of failure in the fuel pump fuse, where it is located, how much it will take to replace it, and the diagnostic procedure that will be undertaken.

Let’s get started!

But of course, the fuel pump fuse may be found in other locations. To get the precise position of the fuel pump fuse fast, you should check your repair manual.

Also Read: Engine Rebuild Cost

Bad Fuel Pump Fuse Symptoms

Check engine light

To prevent the eventuality of wrong values being shown, all the engine sensors are always under constant supervision by the engine’s control module. The check engine light comes on in any situation where the engine control module/ ECU suspects transmission of wrong values from any sensor.

This is a very normal symptom of a damaged fuel pump fuse.

The fuel pressure sensor supports/aids the ECU in monitoring the fuel pressure. A trouble code will be stored on the fuel pressure wherever there is a failure in the fuel pump relay. The light indicating you should check the engine will also come on.

Engine hampering

The relay connection may be lost, and eventually, the fuel pump won’t get power if there is improper soldering in the fuel pump relay. If there isn’t proper pressure or if there isn’t adequate fuel in the combustion chamber, the engine will abruptly go off.

The component that makes sure this eventuality doesn’t happen is the fuel pump. But if the fuel pump relay is faulty, it won’t function properly.

Rough acceleration

Fuel delivery into the engine and the fuel pump’s power can be severely affected if the fuel pump relay is damaged. The same way a human heart is running on blood and oxygen is the same way the engine needs fuel to function. So, problems will occur if the fuel pump relay develops issues because the fuel flow into the combustion chamber will be greatly disturbed or even cut off.

A fuel filter that is choked could also cause such a problem. Therefore, it is best to examine the vehicle properly to know the actual problem before changing anything in the vehicle.

No noise from Fuel Pump on ignition

You are supposed to hear a wiring sound from the back of the vehicle anytime you turn on the ignition. That implies that fuel pressure is building up in the fuel rail. If you don’t hear this sound, then the fuel pump relay might be having issues. Then you may try listening for a few seconds to be sure whether there is a slight sound around the fuel tank.

Engine is totally dead

The engine may be dead and won’t start if the Fuel pump is problematic. This is because the engine can’t start without fuel pressure. If the fuel pump relay fails, fuel pressure won’t be created because the fuel pump won’t receive power.

Cost of Fuel Pump Relay Replacement 

To replace the fuel pump relay would cost around $90-$150. This depends on the cost of labor and the model of the vehicle. Minus the labor cost, the parts would be around $20-$50.

You can get the fuel pump relay at a nearby auto spare parts outlet or even online because it is a tiny electronic device and can be easily acquired. The replacement will cost you both labor and parts.

The replacement may take about 1 hour or even more, so have this in mind when considering labor costs.

Also, the labor cost may differ depending on what the repair shop charges you or the mechanic’s pay per hour. However, apart from the cost of labor, the fuel pump relay would only cost you $20-$50, depending on your car. Therefore, it is not an expensive device.

Diagnosing Fuel Pump Relay

It is usually simple to diagnose a relay. For example, it would be easy in a case where the fuel pump relay possesses 4 pins. But you would have to examine a wiring program if the relay in your car possesses more than 4 pins.

  1. Find the fuse box and find the fuel pump relay
  2. When you find it, raise it and examine underneath it for the numbers 30,85,86 and 87. Put the fuel pump relay back when you find these numbers.
  3. While cycling the ignition, try reaching the pins using a multimeter.
  4. Check pin 87 after you have turned the ignition on. Even though it may be an intermittent issue, if there is voltage, it means the fuel pump relay is functional.
  5. In a situation where there isn’t voltage there, ensure that there is a steady voltage on pin 30. This has to be with the ignition turned on. You may have a broken fuse issue if there isn’t voltage there. When the ignition is on, you must ground pin 86 from the engine control unit, and there should be a constant voltage on pin 85.
  6. According to your findings, if the relay is problematic, check for any bad soldering within it. If you find any, resolder it.

Here is how to carry out an electrical test on your fuel pump.

Also Read: How Long Does an Alternator Last (Every Factor Explained)

Frequently Asked Questions – Fuel Pump Fuse Location

How do I know if my fuel pump fuse is blown?

Car hesitation when starting
Hesitation is also a very common symptom when you want to start the car. There is a probability that the fuel pump is damaged in a situation where the vehicle hesitates when you want to turn the ignition on.

Is there a fuse for the fuel pump relay?

Regardless of where the fuel pump relay may be, what should be after is the fuse box, and you will have to remove the cover to locate the FPR.

Where is the fuel pump relay switch?

The big fuse box in the engine compartment is usually where the relay is situated in most cars.

What would cause a fuel pump not to get power?

Electrical problems in your car could be the reason behind the lack of power in the relay or the fuel pump. But it will be best to first check the ignition fuses to be sure they are not blown and examine the fuel pump and the main EFI. Sometimes, these could prevent power from reaching the fuel system.

Does fuel pump turn on with ignition?

The fuel pump within the fuel tank pumps fuel into the engine wherever you turn on the ignition. Therefore, once you turn the car on, it is functional even with the engine off.

Will a car start with a bad fuel pump relay?

The fuel pump will have no power if the fuel pump relay fails. The car won’t start because of a lack of fuel, even though the engine may crank when you turn on the ignition. You can properly examine the car’s problem because this symptom could be a result of many other problems.

Will the fuel pump run without a relay?

The fuel pump prevents overheating when you turn on your ignition, so it needs a relay. To transit through the contacts, the run circuit ( which the pump will transverse) was made for a given number of amps. It is possible that adding electric fans, fuel pumps, and other accessories may alter the connection.

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